// JavaScript Document

function calcul() {
var prod = new Number(document.devis.produit.value);
var surf = new Number(document.devis.surface.value);

var total = prod*surf;
	
document.devis.total.value = total.toFixed(2) + " euros TTC";
document.devis.prix_m.value = prod.toFixed(2) + " euros TTC";
}